Back portion of a computer housing



FIG. 1 is an elevational view of a back portion of a computer housing wherein the top section of the panel is defined by broken lines;

FIG. 2 is an enlarged fragmentary view thereof wherein broken lines are used to define the top section of the panel as in FIG. 1; and,

FIG. 3 is a perspective view thereof.

The housing of the computer and the circles that are shown in broken lines in the figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the back portion of a computer housing, as shown and described. 